Exhibiting attachment for projecting machines



I. L. COOK EXHIBITING ATTACHMENT FOR PROJECTING MACHINES Oct. 5, 1937.

s Shets-Shet 1 Filed June 9, 1956 ATTORNEYS Oct. 5, 1937. l. L. COOK EXHIBITING ATTACHMENT FOR PROJECTING MACHINES s sheets-sheet 2 ATTORNEYS Oct. 5, 1937. I. L. COOK 2,095,171

EXHIBITING ATTACHMENT FOR PROJECTING MACHINES Filed June 9, 1956 3 Sheets-Sheet5 Y ajy,

Irving K0011 m wmyaw ll;

ATTORN EYS Patented Oct. 5, 1937 [EXHIBITING ATTACHMENT FOR PRO ECT 7 INGi MACHINES j i Irving L. Cook, Gillett, Wis. Application June '9, 1936, Serial 84,352 8 'Claims." (C1. 88-27) *ihijs invention relates to exhibiting attachments for projecting machines and has for ano b ject to provide'an interchangeable photographicv 'film; holder for developing, drying. and projecting machines, the film holder having a central mounting opening for assembling the holder with the selectedmachine, the film holder having. an an- .nular series of radially disposed openings to receive the photographic films, especially dentists,

X-ray films, and permit either the developing materials beingbrought into contact with the films, or to permit air currents to dry the films by spinning the disk on a revolving shaft, or to permit light being projected through the films when the disk isapplied to a projecting machine.

. A further object of the invention is to provide a novel mechanism for adjustably mounting thefilm holder on a projecting machine in such manner that regardless of what position the images on the films may extend, that is, upside down, or otherwise, the holder may be adjusted quickly and easily t o cause the image to be pro.- jected' correctly. H

' r .A further object of theinvention is to provide a device of this character which will be formed of a. few strong simple and durable parts, which will be inexpensive to manufacture, and which will not easily get out of order.

- With the above and other objects in viewthe 3 invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that Various modifications may be resorted to withinthe scope of the appended claims without 35 departing from thespirit or sacrificing any of the advantages of the invention.

- In the accompanying drawings of this specification, U v I Figure l isa side elevation of apparatus con- 40 structed in accordance with the inventionand embodying a projecting machine, a photographic film holder adjustably mounted to rotate on its own axis or to rotate in an orbit around the axis of light projection of the projecting machine, whereby inverted images may be projected rightside up. i

Figure 2 is a front elevation of the support for adjustably mounting the film holder on the barrel of the projecting machine, and showing diagrammatically in dotted lines adjusted positions of the film holder.

Figure 3 is an enlarged longitudinal sectional View taken on the line 33 of Figure 2.

Figure 4 is a front elevation of the swivel ring 55 member of the Support.

. I Figure 10 is a detail sectional view taken on" forming part Figure 5 1s a front elevation of the screen and showing the member for mounting the same on the lamp housing of the projecting machine.

Figure 6 is a detail longitudinal sectional view takenon the line 6-6 of Figure 5. 5

Figure lisa front elevation'of the reflector and the bracket for adjustably mounting the same on the base of the projecting machine.

" Figure 8 is a detail longitudinal sectional View taken' on the line 8 8 of Figure 7. 1.0

' Figure 9 is a front elevation of the photographic.

fil m holder and showinga film in one of the openings thereof.

the line llll0 of Figure 9. 1

:Figuredl is an'enlarged transverse sectional View taken on the line Il-ll of Figure 10.

Referring now to the drawings in which like characters of reference designate similar parts in the variousviews, l2 designates a film holder 20 comprisingia disc of thin sheet metal provided centrally with an opening 13 for mounting the disc as Will be presently described. The disc is provided with. radially disposed struck up angular clips l l and with an annular series of struck 25 up clips H3. The radially disposed clips and annular clipsare arranged in groups of four, each group confining a film l6 to the disc, the films, for example, being dentists X-ray films, and extending 'radially upon the disc, as shown in Figure 9 An annular series of substantially rectangular openings I! are formed in the disc, each opening being within'the space bounded by a groupof four clips i4-i5 so that both sides of the central portion ,l8 of film 16 are exposed for treatment such as developing, drying, or project- "'The film holder is provided with an annular series of indentations l9 concentric with the cen tral opening it, each pair of diametrically op-, 40

posed indentations being located in a diameter of the disc passing through the median longitudinal lines of s an of oppositely disposed films. The purpose of these openings is to center the film accurately with respect to the axis of light projection of s projecting machine such as is shown'in Figure 1..

' The projecting machine is of the conventional type including a light housing 20 mounted ona base 2!, there being a standard 22 on the base in O front of the light housing for sup-porting the lens barrel 23 of the projecting machine. For mounting the above described film holder same projecting machine, a stationary channeled ringf 2] is disposed concentrically on the end of the beam concentrating shield of the projecting machine and is supported by diverging legs 26 each comprising a tube 27 which is fixed at one end to the rear face of the ring, and a rod 28 which is telescopically received in the tube and held in adjusted positions therein by a set screw 29. Each rod is directed outwardly at the bottom to provide a foot 30 which is fixed to the projecting machine base 2| by a screw 35. The stationary ring is provided in the base of the channel thereof with indentations 32 disposed 90 degrees apart, the purpose of which will presently appear.

A movable ring 33 is rotatably mounted in the channel of the stationary ring 24, and is pref erably a resilient split ring having cars 34 which are adjustable toward or away from each other by a screw pin 35 carried by one of the ears and a nut 36 on the pin bearing against the other ear. Movement of the nut varies the diameter of the ring and increases or diminishes the frictional engagement of the ring with the stationary ring. The ring is provided with a rod 31 which extends radially from one side of the ring and receives a block 38 for supporting the film holder I2 on the rod.

The block 33 is provided with a set screw 39 which holds the block in adjusted positions longitudinally of the rod and permits of assembly and disassembly of the block on the rod. The end of the rod is provided with a stop Ml which may be simply a pin assembled with the rod and having a head of larger diameter than the rod. Removal of the stop permits removal of the block 38 and when the stop is in place, should the set screw 39 be loosened, the stop will prevent the block from escape from the rod 37.

For mounting the film holder [2 on the block a threaded pin 1! is screwed into the front face of the block and receives a nut 2 having a tubular flange 63 which enters a cylindrical cap 44. A helical spring [55 is housed in the cap between the end wall of the cap and the end of the tubular flange on the nut. The film holder is mounted for rotation on the pin 4! as an axis by removing the nut 62 and cap 65 then the pin 4! may he slipped through the central opening I3 in the disc and the cap and nut replaced; The nut 42 may now be tightened to compress the spring thereby urging the cap 44 to frictionally engage the disc and act as a brake.

A pair of ball stops 46 are disposed in seats 41 formed in the front face of the block 38 and are yieldably urged outwardly by helical springs 48 disposed in openings 49 formed in the block on opposite sides of the pin 4!. These ball stops 46 enter a pair of the indentations 19 in the rear face of the disc l2 and center a film [B with respect to the axis of light projection indicated at 5B in Figure 1.

Referring now to Figure 3 it will be seen that a ball stop 5| is disposed in a seat 52 formed in the inner periphery of the movable ring 33. The ball stop is urged toward the center of the ring by a helical spring 53 disposed in an opening 55: formed in the ring and in the rod 31. This ball stop rides into the indentations 32 disposed 90 degrees apart in the channel of the stationary ring 24 and locates the rod 3'! at any selected indentation for correctly projecting an image regardless of whether it be located upside down or otherwise on the film.

The projected image is reflected from an inclined mirror 55 onto a screen 55 and there displayed greatly magnified so that in the case of tions therein by a set screw 65.

aoe'snvi the image of a tooth, for example, defects will be readily apparent to the observer.

The mirror is provided with an attaching arm 57 which terminates in a ball 58 that is frictionally engaged, as shown in Figure 8, between a plug 59 in a casing Gil and a disc 6| which is slid ably fitted in the casing and is urged against the ball by a helical spring 62. Thus the mirror may be adjusted to various angular positions to properly locate the reflected image on the screen. The casing is provided with a stem 63 which is adjustably mounted for vertical movement in a tubular bracket 64 and held in adjusted posi- The stem is provided with a horizontal leg 63 which is secured by straps 6'! and set screws 68 to the base 2| of the projecting machine below the lens barrel 23.

The screen 56 is preferably formed of sheet metal and is provided at the top with a trough 69 to receive a roll ii) of paper which may be drawn down over the front face of the screen as shown at H and there secured by clips 12 placed astride the edges of the sheet and the screen, or the sheet may be otherwise fastened in place as desired. The screen is provided at the bottom with a bracket arm 73 which terminates in a ball l4 that is confined in a seat 15 formed in a post 76 by means of a screw cap Tl so that the angular inclination of the screen may be adjusted as desired. The post terminates in a fiange base '98 which is supported upon the top of the light housing 23, as shown in Figures 1 and 5.

A pair of screw pins 79 are threaded into the post 76 and receive hooks 80 which are engaged underneath the ventilator 8! of the light housing. Nuts 82 are threaded on the pins and force spacing tubes 33 against the hooks and cause the same to tightly grip the ventilator to mount the screen on the projecting machine. Loosening of the nuts permits the hooks to be slacked off to facilitate removal of the screen.

In operation the film holder has three separate uses, in sequence, for the developing, drying and projecting of films. After the exposures are made, the films I8 are applied to the clips of the holder, as shown in'Figure 9, and no particular care need be taken as to whether the images are right-side up or not. The film holder with the films thereon is now revolved in a developing tank of conventional type, the central opening I3 forming means rotatably mounting the holder on the usual shaft in the developing tank. After the developing operation the film holder with the developed films thereon is placed on a suitable driven shaft and rapidly rotated for a period of about three minutes to thoroughly dry the films. The film holder with the dried films thereon is now placed on the pin 4| and the block 38 is adjusted so that the center of any selected film will coincide with the axis of light projection of the projecting machine. If it is found that the image is inverted, or otherwise not in natural position, when reflected upon the screen, it is simply necessary to swing the rod 37 to the right or to the left in an orbit around the axis of light projection as shown diagrammatically by dotted lines in Figure 2 to 50 reverse the film that the image will appear rightside up when reflected upon the screen.

From the above description it is thought that the construction and operation of the invention will be fully understood without further explana- 'tion.

What is claimed is:

1. Exhibiting means for a projecting machine having alight projecting means and a focusing lens forwardly thereof, said exhibiting means including relatively movable nested rings adapted to be disposed in rear of the focusing lens of a projecting machine, concentric with the axis of light projection, an arm projecting radially from one of the rings, a horizontal axis on said arm, a holder having a circular series of film holders mounted to rotate thereon, means for adjusting the rings to dispose the arm at selected radial positions with respect to the axis of light pro, jection, and means for centering a selected film holder in the axis of light projection.

2. Exhibiting means for a projecting machine having a light projecting means and a focusing lens forwardly thereof, said exhibiting means including the combination of a stationary ring adapted to be disposed in rear of the focusing lens of a projecting machine concentricwith the axis of light projection, a ring rotatably mounted on the stationary ring, an arm projecting radially from the rotary'ring and movable withsaid rotatable ring in an orbit around the stationary ring, a horizontal axis on said arm, a holder having a circular series of film holders mounted to rotate thereon, means between said rings for disposing the rotatable ring with the arm at selected adjusted positions around the stationary ring, and means between the holder and the arm for centering a selected film holder in the axis of light projection. V j

3. Exhibiting means for a'projecting machine having a light projecting means and a focusing lens forwardly thereof, said exhibiting means ineluding the combination of a stationary ring adapted to-bedisposed in rear of the focusing lens of a projecting machine concentric with the axis of light projection, a ring rotatably mounted on the stationary ring, an arm projecting radially from the rotary ring and movable in an orbit around the stationary ring by movement of the rotary ring, a block adjustably mounted on the arm, an apertured film supporting disc having a central opening, means on the block engageable through the centralopening for mountingthe disc to rotate on a horizontal axis, means on the disc for securing photographic films over the apertures on the disc in a circular series concentric with said central opening, a circular series of sockets on the disc concentric with said central opening, a spring pressed stop on the block selectively engageable in said sockets for centering a selected film in the axis of light projection, and means between both rings for disposing the arm at selected adjusted positions around the stationary ring.

4. Exhibiting means for a projecting machine having a light projecting means a, and a focusing lens forwardly thereof, said exhibiting means in-' cluding the combination of a stationary ring adapted to'be disposed in rear of the focusing lens of a projecting machine concentric with the axis of light projection, a ring rotatably mounted on the stationary ring, an arm projecting radially from the rotary ring and movable in an orbit around the stationary ringbymovement of the rotary ring, there being a plurality of sockets on the stationary ring, a spring pressed stop on the rotary ring at the base of said arm selectively engageable in said sockets to hold the arm stationary at various adjusted positions radially withrespect to the axis of light projection, a film holder mounted to rotate on a horizontal axis on the arm, means for securing photographic films in a circular series on the holder concentric with said axis, and means between the holder and the arm for centering a selected film in the axis of light projection.

5. Exhibiting means for a projecting machine having alight projecting means and a focusing lens forwardly thereof, said exhibiting means in cluding an adjustable supporting means comprising an adjustable axis for a film holding disc, a film holding disc having a circular series of film holders to be rotatably mounted on said adjustable axis, means for holding the film holder disc for centering each of the film holders with respect to the light projectingmeans and focusing lens, a movable nested ring support for said adjustable axis of the film holding disc, and a stationary co-acting ring support for said movable nested ring support whereby any film in any of the film holders may be axially rotated with respect to the light projecting means and focusing lens.

6. Exhibiting means for a projecting machine having a light projecting means and a focusing lens forwardly thereof, said exhibiting'means including an adjustable supporting means comprising an adjustable axis for a film holding disc, a film holding disc'having a circular series of film holders to be rotatably mounted on said adjustable axis, means for holding the film holder disc for centering each of the film holders with respect to the light projecting means and focusing lens,

a movable nested ring support for said adjustable axis of the film holding disc, a stationary coacting ring support for'said movable nested ring support, and clamping means on said movable ring to secure the same to said stationary ring,

whereby any film in the film holder may be held in any desired axially rotated position with respect to the light projecting means and focusing lens. V

'7. Exhibiting means for a projecting machine having alight projecting means and a focusing lens forwardly thereof, saidexhibiting means including an adjustable supporting means comprising an adjustable axis for a film holding disc, a film holding disc having a circular series of film holders to be rotatably mounted on said adjustable axis, means for holding the film holder disc for centering each of the film holders with respect to the light projecting means and focus- 7 ing lens, a movable nested ring support for said adjustable axis of the film holding disc, a stationary co-acting ring support for said movable nested ring support, clamping means on said movable ring to secure the same to said stationary ring, whereby any film in the film holder may be held in any desired axially rotated position with respect to the light projecting means and focusing lens, co-acting indicator means to show the position of said film holding disc on the supporting adjustable axis, and co-acting to show the position of said movable nested ring relative to said stationary ring. 7

, 8. Exhibiting means for a picture projection machine having a space for receiving films to be projected, said exhibiting means including a rotatable holder having a circular series of film holders, means for mounting said film holder for rotation for positioning the film holders successively inthe film space of the projecting machine, and means for rotating said mounting for the film holder about the center of the film projecting space of the projecting machine. 

